# quiz3 - 1 Considering the following statistical diagrams...

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1. Considering the following statistical diagrams for a set of 55 pH values in a chemical reactor; along with other statistics. Mean = 6.0673 Median = 6.1000 Std Deviation = 0.47339 Range = 2.4000 Minimum = 4.6000 Maximum = 7 75-th %ile = 6.4000 Which of the following is not correct? A) The 25th percentile is about 5.9. B) Some outliers appear to be present below a pH of 5.4. C) About 95% of the observations have pH values in the approximate range 6 ± 1. D) About 10% of the values are in the range 5.8 to 6.0. E) About 75% of the values are less than 6.4. 2. The weights of the male and female students in a class are summarized in

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the following boxplots: Which of the following is NOT correct? A) About 50% of the male students have weights between 150 and 185 lbs. B) About 25% of female students have weights more than 130 lbs. C) The median weight of male students is about 162 lbs. D) The mean weight of female students is about 120 because of symmetry. E) The male students have less variability than the female students. 3.
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## This note was uploaded on 10/08/2010 for the course CHE 220 taught by Professor Elkamel during the Spring '10 term at Waterloo.

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quiz3 - 1 Considering the following statistical diagrams...

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